[xsl] switching between multiple languages in XSL

[Jason Viers <bean@xxxxxxxxxxxx>]

We're transforming a XML file to HTML via XSL, and we'd like the XSL to 
be usable across multiple languages.  The XML file being transformed 
does _not_ have the text we'd like to select between, just an indication 
as to what language should be used.  There are things like static 
headers & footers we'd like to switch between based on the flag in the XML.
  
We'd like to have the language-specific sections in their own files, so 
the language teams can work on them independently of the main XSL file.  
We couldn't find a way to do this using <xsl:import> as we can't have a 
certain one included based on a condition,a nd we can't really "select" 
out of those, as they're not the source document.

Has anyone tried something similar, or have any advice how to approach this?

Thanks
Jason